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[PR #14677] Prevent flickering in nushell due to FTCS marks #30214

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opened 2026-01-31 09:39:22 +00:00 by claunia · 0 comments
claunia commented 2026-01-31 09:39:22 +00:00
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Original Pull Request: https://github.com/microsoft/terminal/pull/14677

State: closed
Merged: Yes

Tl;dr: Conpty would flush a frame whenever it encountered a FTCS mark. Combine that with the whole-line redrawing that nushell does, and the Terminal would get the prompt in two frames instead of one, causing a slight flickering. This fixes that by rendering the frame, but not flushing to the pipe when we encounter one of these sequences.

Closes #13710

A complication here: there are some sequences that we passthrough immediately when we encounter them. For example, \x1b[ 2q. we need to also not flush when we encounter one of these sequences. nushell emits one of these as a part of the prompt, and that would force the buffered frame to get written anyways, before writing that to the pipe.

**Original Pull Request:** https://github.com/microsoft/terminal/pull/14677 **State:** closed **Merged:** Yes --- Tl;dr: Conpty would flush a frame whenever it encountered a FTCS mark. Combine that with the whole-line redrawing that nushell does, and the Terminal would get the prompt in two frames instead of one, causing a slight flickering. This fixes that by rendering the frame, but not flushing to the pipe when we encounter one of these sequences. Closes #13710 A complication here: there are some sequences that we passthrough _immediately_ when we encounter them. For example, `\x1b[ 2q`. we need to also not flush when we encounter one of these sequences. nushell emits one of these as a part of the prompt, and that would force the buffered frame to get written _anyways_, before writing that to the pipe.
claunia added the pull-request label 2026-01-31 09:39:22 +00:00
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Reference: starred/terminal#30214
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